This thing is a GoPro Style Camera 72mm Filter Adapter made with Tinkercad and can be edited online at https://www.tinkercad.com/things/hNQsf4lyOyd The idea of this is provide a way to attach 72mm filters in front of the GoPro Style Camera Action Camera. The reason for such a large filter diameter is to reduce the possibility of vignetting in frame.
Keep in mind the closer the camera lens is to the filter the, less vignetting which will occur so would suggesting sanding as needed the inside ring to archive the desired results. A link to a low cost version of the camera can be found here (http://amzn.to/1muuIAW) and of course more on this and other projects can be found at http://www.DIY3DTech.com and also don't forget to visit our YouTube Channel at http://YouTube.DIY3DTech.com for a full list of video projects including one (https://youtu.be/SvS4iU10-kI) for this!
While 0.2 is workable, the inter-threads improve by printing at 0.1 so you experimenting we would suggest 0.2 however for the finial working version we then kick it up to 0.1 for improved resolution of the inter filter threads.